Die-stock.



H. W. OSTER.

DIE STOCK.

APPLICATION FILED MAY 17, 1913.

Patented Feb. 9, 1915.

THE NORRIS PETERS 00-. PHOWLITHO. WASHINGTON. D. C,

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Specification of Letters Patent.

lPatent-ed Feb. 9, Jlttifi.

Application filed May 17, 1913. Serial No. 768,215.

To all whom it may concern Be it known that I, HERMAN W @srna, a citizenof the United States, residing at Cleveland, in the county of Cuyahogaand State of Ohio, have invented a certain new and useful Improvement inDieStocks, of which the following is a full, clear, and an actdescription.

This invention is an improvement upon the kind of ratchet die stockswhich include a tubular work holder adapted to embrace and be secured tothe pipe tobe threaded, a concentric die carrier which is movable'rotatably and longitudinally with respect to the work holder, and anoperating lever having a ratchet connection with the work holder,whereby the latter may be turned. One trouble with die stocks of thissort is that sometimes when the operating lever is turned backward itcauses the die carrier to likewise turn backward. This is decidedlyobjectionable;- and the primary object of this invention is to preventthis action; and to provide an operative practical ratchet die stock inwhich this action cannot occur.

The invention consists in the combination of parts hereinafter describedand pointed out definitely in the claims.

In the drawing, Figure 1 is a front end view partly broken away, of aratchet die stock embodying the invention. Fig. 2 is a side elevationpartly in longitudinal section.

Referring to the parts by lettersfA represents the tubular work holderwhich is provided with suitable well known means by which it may berigidly fixed to the pipe around which it is placed.

B is the tubular die carrier having a sleeve 6 which is adapted totelescope into the work holder. Preferably this sleeve is externallythreaded, and the work holder is internally threaded so that the formermay be screwed into the latter. These engaging threads form what isknown in this art as a lead screw, a desirable but not essential featureof the construction. The dies C are carried by the die carrier, and areadjustably held in place thereon by any suitable or usual means.

A ring D is rotatably mounted upon the Work holder in a circumferentialgroove thereon, so that while it may be turned upon the work holder itcannot move longitudinally with respect thereto. Pins E fixed to thisring project through longitudinal holes 5 in the die carrier; andtherefore the ring D must turn with the die carrier,

although, the die carrier in turning moves longitudinally with respectto said ring.

A ratchet sleeve CT is rotatively mounted upon the outer edge of the diecarrier, being held against longitudinal movement thereon by the flange6 and the gib ring F. The outer periphery of the die carrier between theflange b and gib ring F is formed with ratchet teeth 6 The sleeve Gcarries a spring pawl g which, on its inner end, is beveled as shown, sothat when the sleeve is turned in one direction relative to the diecarrier, the beveled end of the pawl engaging one of the teeth 6 will bethrust backward and the sleeve G allowed to turn on the die carrier.When the sleeve is turned in the opposite direction, the pawl will gobetween two teeth and therefore the die carrier will be compelled toturn with the sleeve. 1

G11 the outer cylindrical surface of the work holder in front of thering D are the ratchet teeth a. A pawl K is pivoted to the front face ofring D and is adapted to engage with said ratchet teeth. The end of thepawl is beveled so that when the die carrier and consequently ring D,are being turned in the thread cutting direction relative to the workholder, the pawl will slip over the ratchet teeth. When, however, thedie carrier and ring are subjected to a force tending to turn them. inthe contrary direction, this pawl will automatically engage the ratchetteeth and prevent such turning relative to the work holder.

The pawl K has two fingers M, k which are bent down by the side of thering D. A coil spring 70 interposed between one of these fingers 1: andthe ring acts on the pawl to hold it in engagement with the ratchetteeth. The other finger 72 affords a convenient handle wherewith theoperator may move the pawl. When it is desired (as it is when the diecarrier is being backed off of a threaded pipe) to disengage the pawl Kfrom the work holder, the operator takes hold of the finger is and pullsit outward, thereby rocking the pawl in opposition to its spring. Inthat face of the tail of the pawl which is adjacent to the front face ofthe ring B there is a spot hole k which is adapted to engage with theouter end of a spring plunger J seated in a recess in the ring. When thepawl is wholly withdrawn from engagement with the ratchet, this plungerengaging in this spot hole will hold the pawl in the withdrawn positionuntil suflicient pressure is applied to the pawl to so swing itas tocause the disengagement of said plunger and spot hole.

I-Iaving described'my invention, I claim: 1. In a die stock, thecombination of a tubular work holder adapted to be secured to the pipeto be threaded, a tubular die carrier' which is rotatable and movablelongitudinally with respect to the work holder, a ring which isrotatable upon the work holder but is incapable of longitudinal movementthereon, means compelling the die carrier and ring to rotate in unison,a ratchet sleeve rotatable upon the die carrier', a ratchet connectionbetween said sleeve and die carrier, and a ratchet connection-betweenthe work holder and the ring which is rotatably mounted thereon.

2. In a die stock, the combination of a tubular work holder, aconcentric tubular die carrier which is rotatable and movablelongitudinally with respect to the work holder, a ring which isrotatable upon the work holder but is incapable of longitudinal movementthereon, means compelling the die carrier and ring to rotate in unison,a ratchet sleeve rotatably mounted upon the die carrier, a ratchetconnection between said sleeve and die carrier, a spring pawl mounted onthe ring, there being ratchet teeth on that part of the work holderwhich teeth on that part of the work holder which is adjacent to saidring with which said spring pawl may be engaged, and means for holdingsaid spring pawl out of engagement with said ratchet teeth.

In testimony whereof, I hereunto afiix my signature in the presence oftwo witnesses.

HERMAN W. OSTER.

Witnesses:

R. B. TnwnsnunY, JAY A. HIGBEE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of latents,

Washington, I). 0.

